Microlensing and Halo Models of the Galaxy
Open Access
- 1 June 1996
- journal article
- research article
- Published by Oxford University Press (OUP) in Publications of the Astronomical Society of Japan
- Vol. 48 (3) , 479-487
- https://doi.org/10.1093/pasj/48.3.479
Abstract
We investigated the dependence of the optical depth (τ) of microlensing events on certain model parameters of the galactic halo. We only considered models in which the rotation curve inside the sun is compatible with the observation. It was found that τ varies up to a factor of 3.5 from those spherical models with a flat rotation curve. This implies that only the most centrally concentrated halo model can be consistent with observation if the halo consists of only MACHOs. We also discuss the power (x) of IMF of MACHOs consistent with the observation by Tyson (1988, AAA 46.157.001) and Bahcall et al. (1994, AAA 62.155.120) assuming that MACHOs are low-mass stars. It is found that x is greater than 5.Keywords
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